Ian McKellen was 63 in The Lord of the Rings: The Return of the King when he played the character 'Gandalf'.
That was over 20 years ago in 2003.
Today he is 84, and has starred in 125 movies in total, 66 of those since The Lord of the Rings: The Return of the King was released.
In The Lord of the Rings: The Return of the King, I think Ian McKellen looks: